A&A 579, A74 (2015) Astronomy DOI: 10.1051/0004-6361/201525665 & c ESO 2015 Astrophysics Spectrophotometric analysis of gamma-ray burst afterglow extinction curves with X-Shooter?;?? J. Japelj1, S. Covino2, A. Gomboc1, S. D. Vergani3;2, P. Goldoni4, J. Selsing5, Z. Cano6, V. D’Elia7;8, H. Flores3, J. P. U. Fynbo5, F. Hammer3, J. Hjorth5, P. Jakobsson6, L. Kaper9, D. Kopacˇ10, T. Krühler11;5, A. Melandri2, S. Piranomonte7, R. Sánchez-Ramírez12;13;14, G. Tagliaferri2, N. R. Tanvir15, A. de Ugarte Postigo14, D. Watson5, and R. A. M. J. Wijers9 1 Faculty of Mathematics and Physics, University of Ljubljana, Jadranska ulica 19, 1000 Ljubljana, Slovenia e-mail:
[email protected] 2 INAF, Osservatorio Astronomico di Brera, via E. Bianchi 46, 23807 Merate, Italy 3 GEPI-Observatoire de Paris Meudon. 5 Place Jules Janssen, 92195 Meudon, France 4 APC, Astroparticule et Cosmologie, Univ. Paris Diderot, CNRS/IN2P3, CEA/Irfu, Obs. de Paris, Sorbonne Paris Cité, 10 rue Alice Domon et Léonie Duquet, 75205 Paris Cedex 13, France 5 Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen Ø, Denmark 6 Centre for Astrophysics and Cosmology, Science Institute, University of Iceland, Dunhagi 5, 107 Reykjavík, Iceland 7 INAF–Osservatorio Astronomico di Roma, via di Frascati 33, 00040 Monte Porzio Catone, Italy 8 ASI–Science Data Center, via del Politecnico snc, 00133 Rome, Italy 9 Astronomical Institute Anton Pannekoek, University of Amsterdam, PO Box 94249, 1090 GE Amsterdam, The Netherlands 10 ARI – Liverpool John Moores University, IC2 Liverpool Science Park, 146 Brownlow Hill, Liverpool, L3 5RF, UK 11 European Southern Observatory, Alonso de Coórdova 3107, Vitacura, Casilla 19001, Santiago 19, Chile 12 Unidad Asociada Grupo Ciencias Planetarias (UPV/EHU, IAA-CSIC), Departamento de Física Aplicada I, E.T.S.